Well...
I didn't like it.
I can't have a score multiplier if I want to circle a continue, so if I tried to go on with my multiplier and after a minute or two i crashed against something, I had to do a lot again. Believe me, that happened a much.
If I don't go for the multiplier and try to avoid everything, this game becomes boring and because it never changed for the 15 minutes I played, this game gets a two.
Also the tempo that never changes allows you to do nothing but to ride in a small circle once in a while.